Hot-air furnace



2 Sheets-Sheet 1.

N. A. BOYNTON.

H0t-Air Furnace.

Patented Feb. 8, 1853.

u mERS. Phom-Lium n m. Washington. [1.0.

. 2 Sheets-Sheet 2. N. A. BOYNTON.

H0t-Air Furnace.

No. 9,573. Patented Feb. 8, 1853.

UNITED STATES PATENT OFFICE.

NATHL. A. BOYNTON, OF BOSTON, MASSACHUSETTS.

HOT-AIR FURNACE.

Specification, of LettersEatent No. 9,573, dated February 8, 1853.

To all whom it may concern:

Be it known that I, NATHANIEL A. BoYN- TON, of Boston, in the county ofSufiolk and State of Massachusetts, have invented certain new and usefulImprovements in Hot- Air Furnaces for anning Buildings or the ApartmentsTrereof; and I do hereby declare that the same are fully described andrepresented in the following specification and the accompanyingdrawings, letters, figures, and references thereof.

front elevation of my improved furnace.

through the fire place and ash pit doorways. Fig. 3 is a side elevationof the ash pit box,

the fire pot, the melon shaped dome or; smoke chamber,'the wheelradiator and ltsg revolving cap discharge tube. Fig. 4 is a horizontalsection of the fire place dome or i Fig. 5 1s a horizontal sec smokechamber.

tion of the wheel radiator. Fig. 6 is a vertical transverse section ofthe said radiator. Fig. 7 1s a side view of the vertical stem tor or onemade with a horizontal stern valve. Fig. 10 is a horizontal section ofthe same hub exhibiting a top view of its valve and valve stem. Fig. 11is a vertical cross section of the spherical hub taken through two ofthe depressions of the valve and two corresponding arm openings of thehub. Fig. 12 is a similar vertical cross section taken at right anglesto the plane of section of Fig. 11.

In the said drawings A represents the fire pot or chamber for holdingthe fuel while in a state of combustion. It is a hollow cylinder orother proper shape having a grate B at its lower part and made to restover an ash pit or chamber C, whose entrance passage is seen at D and ashaving a door E. Resting directly on and above the fire pot is what Iterm the melon shaped smoke chamber or dome F, which is a hollowmetallic vessel made externally in the shape, or closely approximatingthereto, of a musk melon or cantaloup, that is to say, it is corrugatedor made serpentine in a horizontal direction, as seen in Fig. 4, and iscurved in a vertical direction or on its sides, so that the corrugationsshall diminish as they recede upward or downward from the middle parttoward the top or bottom, where they terminate in vertical circular, orother proper shaped rings a, b, by which the smoke chamber is joined tothe fire pot, and the wheel radiator G to be hereinafter described. Sucha construction of the smoke dome of the fire pot enables me to obtain agreatly reduced capacity of it under a great extent of internal as wellas external surface, a large part of the internal surface being broughtinto such a relation with respect 1 to the column of flame and smokearising Of the said drawlngs Flgure 1 denotes a from the fuel that thesaid column directly impinges against it. Fig. 2 is a vertical andcentral section taken A dome or smoke chamber made in the above formwill be found to be a very decided improvement over the commoncylindrical or frustro-conical chambers such as are made either with orwithout fluted sides.

The volatile products of combustion pass from the smoke chamber into thehollow hub H of the wheel radiator G. I term such radiator a wheelradiator because it is made with a hollow rim or annulus I, a hollowcylindrical or barrel shaped hub H (open at top and bottom), and hollowspokes L, L, M, M which open both into the hub and rim. Horizontallyacross the middle of the hub is a plate or partition N (see Fig. 5)which has two sectoral openings a, (Z, made through it and two sectoraldepressions or concavities e, f, which latter may be said to be aprolongation of the lower half of the arms M, M, as they open into thesaid arms and the upper half part of the hollow hub. of a peculiarconstruction rests and moves on the plate or partition N. It is shapedlike such partition, but has its position reversed thereon, or isarranged on it as seen in the drawings. It is attached to the lower partof a vertical stem P that proceeds through the top of the hub and thecap or hood R and has a crank arm Q on its upper end, the said crank armbeing jointed to a slide rod S. By taking hold of the slide rod andmoving it the valve may be turned through an arc of ninety degrees. Nowwhen the valve is made to cover the orifice 0 (Z, the smoke and volatileproducts of combustion will be caused to pass from the lower half of thehub and through the pipes or arms L, L, and into the hollow rim I andfrom thence pass through the pipes M, M into the upper half of the hubor the space over the valve. When the valve is turned around ninetydegrees from such position it A vertical stem valve 0 will close theinner ends of the arms M, M and open the orifice 0, (Z, thereby causingthe smoke and volatile products to pass directly upward through theopenings 0, d, without first coursing through the arms and rim of theradiator.

As to the radiator, the fire pot and melon shaped smoke chamber areplaced within a chamber U into which cold air passes and from whichafter being heated therein it escapes through proper pipes leading, respectively, to such apartments as it maybe desirable to warm, the columnof air which rises in. the said chamber is brought into contact with theexternal surfaces of the hub, the spokes and the rim of the radiator,and is thereby warmed to great advantage, much more so than is the casewhere a ring radiator is used with vertical pipes leading int-o it fromthe smoke chamber.

As it is often desirable to make use of a valve having a horizontalstem, 1 construct the valve and its hub as seen in Figs. 9, 10, 11, and12. The hub is a hollow sphere or portion thereof at that part g of itwhich receives the arms or is joined to them or has their orifices m, n,0, p, and the whole hub is made high enough to allow the valve to freelyturn within it. In conbination with such a spherical shape in whole or:part 1 make the valve circular and with two angular sectoral depressionsas, 7*, extending below one face of it and 111 opposite directions fromits center. The opposite side of the valve has two similar (lepressionss, 2,, which are placed or arranged between the first two 00, r. Thevalve turns on journals at u, o, and has a stem 10 extended horizontallyfrom it.

The outer edges of the valve are disposed in the sur face of a sphere soas to allow the valve to be turned within the spherical part of the hub.Now when the valve is disposed in a horizontal position the smoke willpass through the arms and rim of the radiator, but when it is turned upinto a vertical position the smoke will escape directly up through thehub and not first pass through the arms and rim.

Having thus described my invention I do not claim a hollow ring radiatorplaced over and made to communicate with the chamber of combustion, but

What I do claim is The above described hollow wheel radiator made with ahollow rim, hollow spokes, a hollow hub (open at top and bottom), and avalve and valve seat so made and applied to the hub that when the valveis closed it shall cause the heat and volatile products of combustion topass through one or more of the arms and into and through the hollowrim, and thence out of the said rim through the other arm or arms andinto the hub and over the valve, and also so that when the said valve isopened the heat and volatile products of combustion may pass directly upthrough the hub without first circulating through the hollow arms andrim, substantially as specified.

In testimony whereof I have hereto set my signature this twelfth day ofFebruary, A. D. 1852.

N. A. BOYNTON.

